A synthetic copolymer of styrene and isoprene, used as a film former.
What it is
Styrene/isoprene copolymer is a synthetic copolymer of styrene and isoprene, a type of synthetic rubber. CosIng lists it as a film-forming and opacifying ingredient.
Where it is used
Found in a small number of products.
Limits of interpretation
The INCI list shows which ingredients are present, not how much of each. Above 1%, ingredients are listed in descending order of weight; below 1% the order is free.
The INCI name does not show the molecular weight or the ratio of the monomers.
Functions
- Film forming
- Producing (upon application) a continuous film on the skin, hair or nails.
- Opacifying
- Reducing transparency or translucency of cosmetics.
EU regulation
This ingredient is not listed in the annexes of Regulation (EC) No 1223/2009 in the CosIng data.